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unknown photographer, .  (2016, January 07). Keegan, Sir John Desmond Patrick (1934–2012). Oxford Dictionary of National Biography. Retrieved 23 Apr. 2021, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-1014869.

unknown photographer, . "Keegan, Sir John Desmond Patrick (1934–2012)." Oxford Dictionary of National Biography.  January 07, 2016. Oxford University Press. Date of access 23 Apr. 2021, <https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-1014869>

unknown photographer, . "Keegan, Sir John Desmond Patrick (1934–2012)." Oxford Dictionary of National Biography. 7 Jan. 2016; Accessed 23 Apr. 2021. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-1014869.